Richard Hammond's Brain Reaction

Victoria Coren Mitchell and teammate Guz Khan go head-to-head with Johnny Vegas and Kiri Pritchard-McLean. And, as always, bringing the science smarts is comedian and brain box Ria Lina.

In a baffling experiment that pits a strongman against an egg, Richard gets more than he bargained for when the strongman attempts to lift him above his head.

Johnny is left red-faced after an investigation into our sense of touch puts him in a compromising situation with Kiri.

Former tennis pro Miles Maclagan joins the teams to demonstrate the incredible speed of his serve. And in an explosive game of Dynamite versus Booze, Victoria and Johnny try to work out which will do the best job of blowing up a shed.